JP2019100491A - Relief valve and gas fuel supply unit - Google Patents

Abstract

To provide a relief valve and a gas fuel supply unit, which can be reduced in size.SOLUTION: An aspect of the present disclosure provides a medium pressure relief valve 50 and a low pressure relief valve 52, each of which has a valve chamber 78, a valve element 75 provided in the valve chamber 78, and a valve seat 74 provided at a position in the axial direction of the valve element 75 with respect to the valve element 75, and in each of which the valve element 75 is contacted with and separated from the valve seat 74. The medium pressure relief valve and the low pressure relief valve each have an inflow port 73 that is provided inside the valve seat 74 and allows hydrogen gas to flow in the valve chamber 78, discharge holes 85 that allow the hydrogen gas in the valve chamber 78 to be discharged to the outside of the valve chamber 78, and a spring 76 urging the valve element 75 to the valve seat 74 side. The discharge holes 85 are provided at positions in the radial direction of the valve element 75 with respect to the valve element 75, and a part of the valve element 75 is provided to pass inside the spring 76.SELECTED DRAWING: Figure 3

Description

  The present disclosure relates to a relief valve and a gas fuel supply unit provided with the relief valve.

  Patent Document 1 discloses a relief valve provided in a refrigerant compressor. The relief valve releases the refrigerant gas in the discharge chamber to the atmosphere to reduce the pressure in the discharge chamber when the discharge chamber into which the compressed high-pressure refrigerant gas is discharged has an abnormally high pressure.

JP, 2010-144922, A

  According to the relief valve disclosed in Patent Document 1, the refrigerant gas in the discharge chamber flows in from the inlet and is released to the atmosphere from the outlet formed in the axial direction of the valve body. At this time, the refrigerant gas is discharged from the outlet to the atmosphere along the axial direction of the valve body from the inlet through the valve chamber, the gas passage, the notch, and the passage inside the second body. As described above, the relief valve disclosed in Patent Document 1 includes the valve chamber, the gas passage, the notch, and the passage inside the second body along the axial direction of the valve body. It will enlarge in the direction. Further, the relief valve disclosed in Patent Document 1 is a gas for flowing the refrigerant gas between the peripheral surface of the valve body and the inner peripheral surface of the first body on the outside in the radial direction of the valve body with respect to the valve body. Since the passage is formed, the radial direction of the valve body is also increased.

  Then, this indication is made in order to solve an above-mentioned problem, and it aims at providing a relief valve and gas fuel supply unit which can be miniaturized.

  One embodiment of the present disclosure made to solve the above problems includes a valve chamber, a valve body provided in the valve chamber, and a valve seat provided at an axial position of the valve body with respect to the valve body. A relief valve for bringing the valve body into contact with and away from the valve seat, an inlet provided inside the valve seat for allowing fluid to flow into the valve chamber, and fluid in the valve chamber And a biasing member for biasing the valve body toward the valve seat, wherein the discharge hole is a radial position of the valve body relative to the valve body. And a part of the valve body is provided to pass through the inside of the biasing member.

  According to this aspect, since the discharge hole is provided at the radial position of the valve body with respect to the valve body, the discharge direction of the fluid may be not the axial direction of the valve body but the radial direction of the valve body. it can. Therefore, since it is not necessary to provide a passage for fluid to flow inside the valve body, the valve body can be miniaturized. In addition, since a part of the valve body is provided to pass through the inside of the biasing member, the valve body can be further miniaturized. Therefore, since the relief valve can be miniaturized, the space for mounting the relief valve can be reduced.

  In said aspect, it has a cover which is a member different from the other member with which the said valve seat is provided, The said cover forms the said valve chamber inside in the state attached to the said other member, The said valve It is preferable to accommodate the said valve body and the said biasing member indoors.

  According to this aspect, since the valve seat provided on the mating member is exposed to the surface when the mating member is single, the valve seat is processed with high accuracy in a state where the valve seat is exposed, and the surface accuracy of the valve seating Can be improved.

  In the above aspect, preferably the discharge hole is provided in the cover.

  According to this aspect, the flow rate of the fluid that can be released can be easily adjusted by adjusting the number and size of the discharge holes formed in the cover.

  In the above aspect, preferably, the valve body and the biasing member are supported by the cover.

  According to this aspect, it is not necessary to separately provide a member for supporting the valve body and the biasing member. Therefore, while being able to reduce the number of parts about a relief valve, it can miniaturize further.

  In the above aspect, the valve seat is preferably provided on the outer surface of the mating member.

  According to this aspect, the valve seat provided on the mating member is easily exposed to the surface when the mating member is single. Therefore, since it becomes easy to process a valve seat, the surface accuracy of a valve seat can be improved.

  In the above aspect, the mating member includes, as the outer surface, an outer wall surface, and a protruding surface formed at a tip of a protruding portion that protrudes outward from the outer wall surface, and the valve seat includes Preferably, it is provided on the projecting surface.

  According to this aspect, since the valve seat is formed in the projecting surface, it becomes easy to process the valve seat in the exposed state before attaching the cover to the mating member. Therefore, the surface accuracy of the valve seat can be more effectively improved.

  Also, the cover can be easily attached to the mating member by attaching the cover to the projection. Therefore, the assembly of the relief valve is facilitated.

  In the above aspect, the cover may be attached to the mating member by welding or caulking, or may be screwed and attached to the mating member and restrained by a lock nut. Is preferred.

  According to this aspect, the cover can be firmly attached to the mating member.

  Another aspect of the present disclosure made to solve the above problems is an introduction passage into which the fuel gas is introduced, a lead-out passage through which the fuel gas is drawn, and the lead-out passage for the fuel gas introduced into the introduction passage. Gas fuel having a fuel gas supply unit for supplying fuel and a relief valve for discharging the fuel gas in the passage to the outside of the passage to release the pressure when the pressure in at least one of the introduction passage and the delivery passage exceeds a predetermined value. In the supply unit, the relief valve includes a valve chamber, a valve body provided in the valve chamber, and a valve seat provided at an axial position of the valve body with respect to the valve body, the valve An inlet for allowing the body to abut and move away from the valve seat, an inlet provided inside the valve seat for allowing fluid to flow into the valve chamber, and discharging the fluid in the valve chamber out of the valve chamber Discharge hole and the valve body A biasing member biased toward the valve seat side, the discharge hole is provided at a radial position of the valve body with respect to the valve body, and a part of the valve body is It is provided so that it may pass inside the said biasing member, It is characterized by the above-mentioned.

  According to this aspect, it is possible to miniaturize the relief valve and miniaturize the gas fuel supply unit. Therefore, the installation space of the gas fuel supply unit can be reduced.

  The relief valve and gas fuel supply unit of the present disclosure can be miniaturized.

It is a schematic block diagram of a fuel cell system. It is a sectional view of a hydrogen supply unit. It is an expanded sectional view of a medium pressure relief valve (low pressure relief valve). It is an expanded sectional view of the medium pressure relief valve (low pressure relief valve) of the 1st modification. It is an expanded sectional view of the medium pressure relief valve (low pressure relief valve) of the 2nd modification.

  An embodiment in which the relief valve and the gas fuel supply unit of the present disclosure are applied to a hydrogen supply unit of a fuel cell system will be described.

[Description of Fuel Cell System]
First, the fuel cell system 1 will be described. As shown in FIG. 1, the fuel cell system 1 includes a fuel cell (FC) 10, a hydrogen cylinder 12, a hydrogen supply passage 14, a hydrogen discharge passage 16, a main stop valve 18, a first switching valve 20, a high pressure regulator 22, hydrogen The supply unit 24, the air supply passage 26, the air discharge passage 28, the air pump 30, the second switching valve 32, the primary pressure sensor 34, the secondary pressure sensor 36, the tertiary pressure sensor 38, the air pressure sensor 40, the controller 42, etc. Have.

  The fuel cell system 1 is mounted on a fuel cell vehicle and used to supply electric power to a driving motor (not shown). The fuel cell 10 generates power by receiving the supply of hydrogen gas as a fuel gas and air as an oxidant gas. The electric power generated by the fuel cell 10 is supplied to a drive motor (not shown) via an inverter (not shown). The hydrogen cylinder 12 stores high pressure hydrogen gas.

  A hydrogen supply system is provided on the anode side of the fuel cell 10. This hydrogen supply system includes a hydrogen supply passage 14 for supplying hydrogen gas from the hydrogen cylinder 12 to the fuel cell 10 of the supply destination, and a hydrogen discharge passage 16 for discharging the hydrogen off gas drawn from the fuel cell 10. Have. The hydrogen supply passage 14 directly downstream of the hydrogen cylinder 12 is provided with a main stop valve 18 formed of a solenoid valve that switches supply and shutoff of hydrogen gas from the hydrogen cylinder 12 to the hydrogen supply passage 14. The hydrogen discharge passage 16 is provided with a first switching valve 20 consisting of a solenoid valve.

  A high pressure regulator 22 for reducing the pressure of hydrogen gas is provided in the hydrogen supply passage 14 downstream of the main stop valve 18. The hydrogen supply passage 14 between the main stop valve 18 and the high pressure regulator 22 is provided with a primary pressure sensor 34 for detecting the pressure therein as the primary pressure P1.

  A secondary pressure sensor 36 is provided in the hydrogen supply passage 14 downstream of the high pressure regulator 22. The secondary pressure sensor 36 detects the pressure in the hydrogen supply passage 14 between the high pressure regulator 22 and the hydrogen supply unit 24 as a secondary pressure P2. The secondary pressure P2 is the pressure in the introduction passage 54 (see FIG. 2) provided in the introduction block 44 of the hydrogen supply unit 24.

  A hydrogen supply unit 24 for adjusting the flow rate of hydrogen gas supplied to the fuel cell 10 is provided in the hydrogen supply passage 14 downstream of the secondary pressure sensor 36. The hydrogen supply unit 24 corresponds to an example of the gas fuel supply unit of the present disclosure. The details of the hydrogen supply unit 24 will be described later.

  A third pressure sensor 38 is provided in the hydrogen supply passage 14 downstream of the hydrogen supply unit 24. The third pressure sensor 38 detects the pressure in the hydrogen supply passage 14 between the hydrogen supply unit 24 and the fuel cell 10 as the third pressure P3. The third pressure P3 is the pressure in the outlet passage 66 (see FIG. 2) provided in the outlet block 46 of the hydrogen supply unit 24.

  On the other hand, on the cathode side of the fuel cell 10, an air supply passage 26 for supplying air to the fuel cell 10 and an air discharge passage 28 for discharging the air off gas led out from the fuel cell 10 are provided. . The air supply passage 26 is provided with an air pump 30 for adjusting the flow rate of air supplied to the fuel cell 10. In the air supply passage 26 downstream of the air pump 30, an air pressure sensor 40 for detecting the air pressure P4 is provided. The air discharge passage 28 is provided with a second switching valve 32 formed of a solenoid valve.

  In the above configuration, the hydrogen gas drawn from the hydrogen cylinder 12 passes through the hydrogen supply passage 14 and is supplied to the fuel cell 10 via the main stop valve 18, the high pressure regulator 22 and the hydrogen supply unit 24. The hydrogen gas supplied to the fuel cell 10 is used for power generation by the fuel cell 10 and is then discharged from the fuel cell 10 as a hydrogen off gas through the hydrogen discharge passage 16 and the first switching valve 20.

  Further, in the above configuration, the air discharged to the air supply passage 26 by the air pump 30 is supplied to the fuel cell 10. The air supplied to the fuel cell 10 is used for power generation by the fuel cell 10, and is then discharged from the fuel cell 10 as an air-off gas through the air discharge passage 28 and the second switching valve 32.

  The fuel cell system 1 further includes a controller (control unit) 42 that controls the system. The controller 42 controls the main stop valve 18 based on the detection values of the primary pressure sensor 34, the secondary pressure sensor 36 and the tertiary pressure sensor 38 in order to control the flow rate of hydrogen gas supplied to the fuel cell 10. The injector 48 provided in the supply unit 24 is controlled. Further, the controller 42 controls the first switching valve 20 to control the flow of the hydrogen off gas in the hydrogen discharge passage 16. On the other hand, the controller 42 controls the air pump 30 based on the detection value of the air pressure sensor 40 in order to control the flow of air supplied to the fuel cell 10.

  Further, the controller 42 controls the second switching valve 32 to control the flow of the air-off gas in the air discharge passage 28. Further, the controller 42 is configured to input a voltage value and a current value related to the power generation of the fuel cell 10, respectively. The controller 42 includes a central processing unit (CPU) and a memory, and controls the injector 48 and the air pump based on a predetermined control program stored in the memory to control the amount of hydrogen gas and the amount of air supplied to the fuel cell 10. Control 30 mag.

[Description of hydrogen supply unit]
Next, the hydrogen supply unit 24 will be described. The hydrogen supply unit 24 includes, as shown in FIGS. 1 and 2, an introduction block 44, a lead-out block 46, an injector 48, an intermediate pressure relief valve 50, a low pressure relief valve 52, and the like.

  The introduction block 44 is a member for distributing the hydrogen gas in the hydrogen supply passage 14 to the injector 48. The introduction block 44 includes an introduction passage 54, a recess 56, an introduction hole 58, a communication passage 60, and the like.

  The introduction passage 54 is a passage through which hydrogen gas is introduced from the hydrogen supply passage 14. The introduction hole 58 and the communication passage 60 are connected to the introduction passage 54.

  The recess 56 is formed to be recessed with respect to one surface of the introduction block 44. The recess 56 is connected to the introduction passage 54 through the introduction hole 58. An injector 48 is disposed inside the recess 56. An inlet pipe 48 b on the inlet side of the injector 48 is fitted in the introduction hole 58. Thus, in the example shown in FIG. 2, the inlet pipes 48b of the three injectors 48 are connected in parallel in the introduction passage 54.

  The communication passage 60 is a passage for connecting the introduction passage 54 and the medium pressure relief valve 50. Further, in the present embodiment, the valve seat 74 of the intermediate pressure relief valve 50 is provided around a portion (portion outside the introduction block 44) opposite to the portion connected to the introduction passage 54 in the communication passage 60. (See Figure 3). Thus, the valve seat 74 is provided on the outer surface of the introduction block 44. More specifically, the introduction block 44 has an outer wall surface 44a and a projecting surface 84 formed at the tip of the projecting portion 83 projecting outward from the outer wall surface 44a as the outer surface thereof, and the valve seat 74 It is formed in the projecting surface 84 (refer FIG. 3). A bolt 64 is fastened to the female screw hole 62.

  Further, the lead-out block 46 is a member for merging the hydrogen gas injected from the injector 48. The lead-out block 46 includes a lead-out passage 66, a nozzle hole 68, a communication passage 70, and the like.

  The outlet passage 66 is a passage through which hydrogen gas is led to the hydrogen supply passage 14.

  A nozzle pipe 48 c on the outlet side of the injector 48 is fitted in the nozzle hole 68. And, in this way, in the example shown in FIG. 2, the nozzle pipes 48 c of the three injectors 48 are connected side by side in parallel to the lead-out passage 66.

  The communication passage 70 is a passage for connecting the outlet passage 66 and the low pressure relief valve 52. Further, in the present embodiment, the valve seat 74 of the low pressure relief valve 52 is provided around a portion (portion outside the lead-out block 46) on the opposite side to the portion connected to the lead-out passage 66 in the communication passage 70. (See Figure 3). Thus, the valve seat 74 is formed on the outer surface of the lead-out block 46. More specifically, the outlet block 46 has an outer wall surface 46a and a projecting surface 88 formed at the tip of the projecting portion 87 projecting outward from the outer wall surface 46a as the outer surface thereof, and the valve seat 74 It is formed in the projecting surface 88 (refer FIG. 3). The bolt 64 is inserted into the bolt hole 72.

  The injector 48 (an example of the “fuel gas supply unit”) supplies the hydrogen gas introduced into the introduction passage 54 to the lead-out passage 66, and adjusts the flow rate and pressure of the hydrogen gas. The injector 48 includes a main body 48a, an inlet pipe 48b, and a nozzle pipe 48c. Then, hydrogen gas enters from the inlet pipe 48b and is discharged from the nozzle pipe 48c. In the example shown in FIG. 2, the hydrogen supply unit 24 has three injectors 48. The number of injectors 48 is not particularly limited, and may be one, two, or four or more.

  In the hydrogen supply unit 24 having such a configuration, the hydrogen gas introduced into the introduction passage 54 is injected into the lead-out passage 66 by the injector 48 to supply the hydrogen cell of the required flow rate to the fuel cell 10.

[Description of relief valve]
Next, the medium pressure relief valve 50 and the low pressure relief valve 52 will be described. The medium pressure relief valve 50 is a pressure release valve that discharges hydrogen gas (an example of “fluid”) inside the introduction passage 54 to the outside of the introduction passage 54 to release the pressure when the pressure in the introduction passage 54 exceeds a predetermined value. It is. The low pressure relief valve 52 is a pressure release valve that discharges hydrogen gas (an example of a “fluid”) inside the discharge passage 66 to the outside of the discharge passage 66 to release the pressure when the pressure in the discharge passage 66 exceeds a predetermined value. is there.

  First, the medium pressure relief valve 50 will be described. As shown in FIG. 2, the medium pressure relief valve 50 is provided at the back of the introduction passage 54. That is, in the introduction passage 54, the medium pressure relief valve 50 is connected to the three introduction holes 58 (in connection with the injector 48) in the flow direction of hydrogen gas flowing in the introduction passage 54 (direction from right to left in FIG. 2). And the lower side (the left side of FIG. 2) of. The intermediate pressure relief valve 50 is provided in a projecting portion 83 projecting outward from the outer wall surface 44 a of the introduction block 44.

  As shown in FIG. 3, the medium pressure relief valve 50 includes an inflow port 73, a valve seat 74, a valve body 75, a spring 76 (an example of an “biasing member”), and a cover 77.

  The inflow port 73 is provided inside the valve seat 74 formed in an annular shape (for example, an annular shape), and is an opening at one end side (the intermediate pressure relief valve 50 side) in the communication passage 60. The inflow port 73 is a portion that allows hydrogen gas to flow into the valve chamber 78 of the intermediate pressure relief valve 50 from the communication passage 60.

  The valve seat 74 is provided at an axial position of the valve body 75 with respect to the valve body 75. In the present embodiment, the valve seat 74 is provided on the outer surface of the introduction block 44 (an example of the “other member”). That is, the introduction block 44 has an outer wall surface 44a and a projecting surface 84 formed at the tip of the projecting portion 83 projecting outward from the outer wall surface 44a (upper side in FIGS. 2 and 3) as the outer surface. ing. Further, a valve seat 74 is provided on the projecting surface 84. Since the valve seat 74 is provided on the outer surface of the introduction block 44, the valve seat 74 is exposed before the valve body 75, the spring 76 and the cover 77 are attached to the introduction block 44.

  The valve body 75 is provided opposite the valve seat 74 in a valve chamber 78 formed inside the cover 77, and includes a valve body 79 and a valve seal rubber 80. The valve main body 79 is formed in a stepped columnar shape (for example, a cylindrical shape), and includes a large diameter portion 81 and a small diameter portion 82. The small diameter portion 82 is provided on the opposite side of the large diameter portion 81 to the valve seat 74, and the diameter is smaller than that of the large diameter portion 81. The small diameter portion 82 is provided to pass through the inside of the spring 76. The material of the valve main body 79 is, for example, a metal such as stainless steel. Further, the valve seal rubber 80 is provided on the surface of the large diameter portion 81 on the valve seat 74 side. By moving along the axial direction of the valve body 75, such a valve body 75 contacts and separates from the valve seat 74 to open and close the communication passage 60.

  The spring 76 is provided outside the small diameter portion 82 of the valve body 75 in the valve chamber 78. That is, the spring 76 is a wire formed in a spiral shape, and the small diameter portion 82 of the valve body 75 is provided in the space inside the spiral shape. Also, one end of the spring 76 is supported by the cover 77, and the other end is supported by the valve body 75. The spring 76 biases the valve body 75 in the valve closing direction (direction of the valve seat 74). The material of the spring 76 is, for example, a metal such as stainless steel.

  The cover 77 is formed in a cylindrical shape (for example, a cylindrical shape), and one axial end (upper end in FIG. 3) of the cylindrical shape protrudes radially inward from the side surface portion It has a guide hole 86, which will be described later, in its central portion. Further, the cover 77 is attached to the projecting portion 83 of the introduction block 44 at the other axial end (the lower end in FIG. 3) of the cylindrical shape. A valve chamber 78 is formed inside the cover 77, and a valve body 75 and a spring 76 are provided inside the valve chamber 78. The material of the cover 77 is, for example, a metal such as stainless steel.

  Thus, the cover 77 is a member separate from the introduction block 44 in which the valve seat 74 is provided, and forms the valve chamber 78 inside the cover 77 in a state of being attached to the projecting portion 83 of the introduction block 44, The valve body 75 and the spring 76 are accommodated in the valve chamber 78. The cover 77 supports one end of the spring 76. Thus, the cover 77 has a role of a retainer (support) for supporting the spring 76.

  In addition, the cover 77 is provided with a release hole 85 for releasing the hydrogen gas in the valve chamber 78 to the outside of the valve chamber 78. The discharge hole 85 is provided in the side surface portion of the cylindrical cover 77 and is provided at a position facing the large diameter portion 81 in the radial direction of the valve body 75. Thus, the discharge hole 85 is provided at the radial position of the valve body 75 with respect to the valve body 75. The number of the release holes 85 is not particularly limited, and may be one or more.

  In addition, the cover 77 is provided with a guide hole 86 penetrating the cover 77 at one end in the axial direction of the cylindrical shape. The small diameter portion 82 of the valve body 75 (specifically, the end of the small diameter portion 82 opposite to the large diameter portion 81 side) is inserted into the guide hole 86. Thus, the valve body 75 can move while being guided by the guide holes 86. Thus, the cover 77 also has a role of a retainer for guiding and supporting the valve body 75.

  Further, the cover 77 is attached to the projection 83 of the introduction block 44 by welding.

  As shown in FIGS. 2 and 3, such an intermediate pressure relief valve 50 urges the valve seal rubber 80 against the valve seat 74 as the valve body 75 is urged toward the valve seat 74 by the spring 76. Close to the valve and maintain the valve closed state.

  Then, the intermediate pressure relief valve 50 discharges the hydrogen gas inside the introduction passage 54 to the outside of the introduction passage 54 when the internal pressure of the introduction passage 54 becomes equal to or higher than a first predetermined value (working pressure on the medium pressure side). Thus, the internal pressure of the introduction passage 54 is lowered.

  Specifically, when the internal pressure of the introduction passage 54 becomes equal to or higher than the first predetermined value, the intermediate pressure relief valve 50 moves away from the valve seat 74 by moving the valve body 75 against the biasing force of the spring 76. To open the valve. Thus, the hydrogen gas in the introduction passage 54 is discharged from the release hole 85 to the outside of the hydrogen supply unit 24 through the communication passage 60, the inflow port 73, and the valve chamber 78. Thus, in the present embodiment, the hydrogen gas is released out of the valve chamber 78 from the release hole 85 formed at the radial position of the valve body 75 with respect to the valve body 75. That is, the hydrogen gas flowing into the valve chamber 78 from the inflow port 73 flows in the radial direction of the valve body 75 without flowing in the axial direction of the valve body 75 and is discharged from the discharge hole 85 to the outside of the valve chamber 78 as it is. . As described above, the pressure in the introduction passage 54 is released to reduce the internal pressure.

  Next, although the low pressure relief valve 52 will be described, since the configuration of the low pressure relief valve 52 is the same as the configuration of the intermediate pressure relief valve 50, differences from the intermediate pressure relief valve 50 will be mainly described.

  As shown in FIG. 2, the low pressure relief valve 52 is provided at a position on the back side of the lead-out passage 66. That is, in the outlet passage 66, the low pressure relief valve 52 has three nozzle holes 68 (connections with the injector 48) in the flow direction of hydrogen gas flowing in the outlet passage 66 (direction from right to left in FIG. 2). It is provided in the position more upstream (right side of FIG. 2). The low pressure relief valve 52 is provided in a projecting portion 87 which protrudes outward from the outer wall surface 46 a of the lead-out block 46.

  As shown in FIG. 3, the inflow port 73 is an opening at one end side (the low pressure relief valve 52 side) in the communication passage 70. The inflow port 73 is a portion that allows hydrogen gas to flow from the communication passage 70 into the valve chamber 78 of the low pressure relief valve 52.

  The valve seat 74 is provided on the outer surface of the lead-out block 46 (an example of the “other member”). That is, the lead-out block 46 is provided with an outer wall surface 46a and a projecting surface 88 formed at the tip of the projecting portion 87 projecting outward from the outer wall surface 46a as the outer surface thereof. Further, a valve seat 74 is provided on the projecting surface 88. Since the valve seat 74 is provided on the outer surface of the lead-out block 46, the valve seat 74 is exposed before the valve body 75, the spring 76 and the cover 77 are attached to the lead-out block 46.

  By moving along the axial direction of the valve body 75, the valve body 75 contacts and separates from the valve seat 74 to open and close the communication passage 70.

  The cover 77 is attached to the projecting portion 87 of the lead-out block 46 at the other axial end (the lower end in FIG. 3) of the cylindrical shape. Thus, the cover 77 is a member separate from the outlet block 46 in which the valve seat 74 is provided, and forms the valve chamber 78 inside the cover 77 in a state of being attached to the projecting portion 87 of the outlet block 46 The valve body 75 and the spring 76 are accommodated in the valve chamber 78. Further, the cover 77 is attached to the projecting portion 87 of the lead-out block 46 by welding.

  Such a low pressure relief valve 52 has an internal pressure in the outlet passage 66 when the internal pressure in the outlet passage 66 becomes equal to or higher than the second predetermined value (the operating pressure on the low pressure side) from the valve closing state shown in FIGS. The internal pressure of the lead-out passage 66 is lowered by discharging the hydrogen gas to the outside of the lead-out passage 66.

  Specifically, when the internal pressure of the outlet passage 66 becomes equal to or higher than the second predetermined value, the low pressure relief valve 52 moves the valve body 75 against the biasing force of the spring 76 and leaves the valve seat 74 Open the valve. As a result, the hydrogen gas in the outlet passage 66 is discharged from the discharge hole 85 to the outside of the hydrogen supply unit 24 through the communication passage 70, the inlet 73 and the valve chamber 78. As described above, the pressure in the lead-out passage 66 is released to reduce the internal pressure.

  Further, as a first modification, as shown in FIG. 4, the cover 77 may be attached to the projection 83 of the introduction block 44 or the projection 87 of the lead block 46 by caulking. Furthermore, as a second modification, as shown in FIG. 5, the cover 77 is screwed to and attached to the projection 83 of the introduction block 44 or the projection 87 of the lead-out block 46, and is restrained by the lock nut 89. It may be done.

  As described above, according to the medium pressure relief valve 50 and the low pressure relief valve 52 of the present embodiment, the release hole 85 is formed at the position of the valve body 75 in the radial direction of the valve body 75. Furthermore, the small diameter portion 82 of the valve main body 79 of the valve body 75 is provided to pass through the inside of the spring 76.

  Thus, since the discharge hole 85 is formed at the position of the valve body 75 in the radial direction with respect to the valve body 75, the hydrogen gas flowing into the valve chamber 78 from the inflow port 73 is taken in the axial direction of the valve body 75. It is possible to flow in the radial direction of the valve body 75 and to discharge it from the discharge hole 85 to the outside of the valve chamber 78 without flowing into the valve chamber 75. That is, the release direction of the hydrogen gas can be made not in the axial direction of the valve body 75 but in the radial direction of the valve body 75. Therefore, since it is not necessary to provide a passage for flowing hydrogen gas inside the valve body 75, the valve body 75 can be miniaturized in the axial direction and the radial direction.

  Further, since the small diameter portion 82 of the valve body 75 is provided to pass through the inside of the spring 76, the valve body 75 can be further miniaturized in its radial direction.

  Thus, since the valve body 75 can be miniaturized, the cover 77 accommodating the valve body 75 can also be miniaturized. Therefore, the medium pressure relief valve 50 and the low pressure relief valve 52 of the present embodiment can be miniaturized so as to reduce the size of the entire valve. Therefore, the mounting space for the intermediate pressure relief valve 50 and the low pressure relief valve 52 can be reduced.

  Since the medium pressure relief valve 50 and the low pressure relief valve 52 can be miniaturized, even if the medium pressure relief valve 50 and the low pressure relief valve 52 are provided on the outer surface of the introduction block 44 and the lead block 46 as shown in FIG. The hydrogen supply unit 24 can be miniaturized. Therefore, securing of the installation space of hydrogen supply unit 24 in fuel cell system 1 becomes easy.

  Further, in the present embodiment, the cover 77 is a member different from the introduction block 44 and the derivation block 46 in which the valve seat 74 is provided. And the cover 77 forms the valve chamber 78 inside in the state attached to the introductory block 44 and the derivation | leading-out block 46, and accommodates the valve body 75 and the spring 76 in the said valve chamber 78. As shown in FIG.

  Thus, the cover 77 is a member different from the introduction block 44 and the derivation block 46, and the valve seat 74 is exposed to the surface by the introduction block 44 alone and the derivation block 46 alone. That is, before the cover 77 is attached to the lead-in block 44 or the lead-out block 46 while accommodating the valve body 75 and the spring 76 in the valve chamber 78, the valve seat 74 provided on the lead-in block 44 or the lead-out block 46 is exposed. Be done. Therefore, since the valve seat 74 can be machined with high accuracy in the state where the valve seat 74 is exposed, the surface accuracy of the valve seat 74 can be improved.

  Further, in the present embodiment, the release holes 85 are formed in the cover 77. Thus, by adjusting the number and size of the release holes 85 formed in the cover 77, it is possible to easily adjust the flow rate of the hydrogen gas that can be released.

  Further, in the present embodiment, the valve body 75 and the spring 76 are supported by the cover 77. Thus, since the cover 77 has a role as a pressing member for supporting the valve body 75 and the spring 76, it is not necessary to separately provide a member for supporting the valve body 75 and the spring 76. Therefore, while being able to reduce the number of parts about medium pressure relief valve 50 and low pressure relief valve 52, it can miniaturize further.

  Further, in the present embodiment, the valve seat 74 is provided on the outer surface of the lead-in block 44 and the lead-out block 46. Thereby, the valve seat 74 provided in the introductory block 44 or the derivation | leading-out block 46 becomes easy to be exposed to the surface, when the introductory block 44 or the derivation | leading-out block 46 is single. Therefore, since the valve seat 74 can be easily processed, the surface accuracy of the valve seat 74 can be improved.

  Further, in the present embodiment, the introduction block 44 and the derivation block 46 are formed on the outer wall surfaces 44a and 46a and the tips of the projecting portions 83 and 87 protruding outward from the outer wall surfaces 44a and 46a as outer surfaces. The surfaces 84 and 88 are provided. And the valve seat 74 is formed in the projecting surface 84,88.

  As described above, since the valve seat 74 is formed on the projecting surfaces 84 and 88, the valve seat 74 can be easily processed in a state where the valve seat 74 is exposed before the cover 77 is attached to the lead-in block 44 and the lead-out block 46. Therefore, the surface accuracy of the valve seat 74 can be improved more effectively.

  Moreover, the introduction block 44 and the derivation | leading-out block 46 are provided with the protrusion part 83,87 which protruded outside from outer wall surface 44a, 46a. Therefore, the cover 77 is attached to the projecting portions 83 and 87 while the valve body 75 and the spring 76 are accommodated in the valve chamber 78 and supported by the cover 77, thereby facilitating the introduction block 44 and the extraction block. It can be attached to the 46. Therefore, since the assembly of the intermediate pressure relief valve 50 and the low pressure relief valve 52 is facilitated, the productivity of the hydrogen supply unit 24 is improved.

  The embodiment described above is merely an example, and does not limit the present disclosure in any way, and it goes without saying that various improvements and modifications can be made without departing from the scope of the invention.

  For example, the valve seat 74 may be formed on the outer wall surface 44 a of the introduction block 44 or the outer wall surface 46 a of the lead-out block 46. Also, the medium pressure relief valve 50 and the low pressure relief valve 52 are not limited to being provided at the back position of the introduction passage 54 or the back position of the lead passage 66, and other positions of the introduction passage 54 It may be provided at another position of the lead-out passage 66.

DESCRIPTION OF SYMBOLS 1 fuel cell system 10 fuel cell 12 hydrogen cylinder 14 hydrogen supply passage 24 hydrogen supply unit 44 introduction block 44 a outer wall surface 46 lead block 46 a outer wall surface 48 injector 50 medium pressure relief valve 52 low pressure relief valve 54 introduction passage 60 communication passage 66 discharge passage 70 communication passage 73 inlet 74 valve seat 75 valve body 76 spring 77 cover 78 valve chamber 79 valve body 81 large diameter portion 82 small diameter portion 83 projecting portion 85 projecting surface 85 release hole 86 guide hole 87 projecting portion 88 projecting surface 89 lock nut

Claims (8)

The valve room,
A valve body provided in the valve chamber;
And a valve seat provided at an axial position of the valve body with respect to the valve body,
A relief valve which brings the valve body into contact with and away from the valve seat.
An inlet provided inside the valve seat for allowing fluid to flow into the valve chamber;
A discharge hole for discharging the fluid in the valve chamber out of the valve chamber;
And a biasing member for biasing the valve body toward the valve seat.
The discharge hole is provided at a radial position of the valve body with respect to the valve body,
And, a part of the valve body is provided to pass through the inside of the biasing member,
A relief valve characterized by In the relief valve of claim 1,
It has a cover which is a separate member from the mating member on which the valve seat is provided,
The cover forms the valve chamber inside when attached to the mating member, and accommodates the valve body and the biasing member in the valve chamber.
A relief valve characterized by In the relief valve of claim 2,
The discharge hole is provided in the cover;
A relief valve characterized by In the relief valve of claim 2 or 3,
The valve body and the biasing member are supported by the cover;
A relief valve characterized by In the relief valve according to any one of claims 2 to 4,
The valve seat is provided on the outer surface of the mating member,
A relief valve characterized by In the relief valve of claim 5,
The mating member includes, as the outer surface, an outer wall surface, and a protruding surface formed at a tip of a protruding portion protruding outward from the outer wall surface.
The valve seat is provided on the projecting surface,
A relief valve characterized by The relief valve according to any one of claims 2 to 6,
The cover may be attached to the mating member by welding or caulking, or may be screwed and attached to the mating member and restrained by a lock nut.
A relief valve characterized by An introduction passage through which the fuel gas is introduced, a lead-out passage through which the fuel gas is drawn, a fuel gas supply unit for supplying the fuel gas introduced into the lead-in passage to the lead-out passage; A gas fuel supply unit having a relief valve for discharging the fuel gas in the passage to the outside of the passage to release the pressure when the pressure in at least one side exceeds a predetermined value;
The relief valve is
A valve chamber, a valve body provided in the valve chamber, and a valve seat provided at an axial position of the valve body with respect to the valve body, the valve body being in contact with the valve seat Contact and separation, and
An inlet provided inside the valve seat for allowing fluid to flow into the valve chamber;
A discharge hole for discharging the fluid in the valve chamber out of the valve chamber;
And a biasing member for biasing the valve body toward the valve seat.
The discharge hole is provided at a radial position of the valve body with respect to the valve body,
And, a part of the valve body is provided to pass through the inside of the biasing member,
A gas fuel supply unit characterized by

Images